Effective Photo‐ and Triboluminescent Europium(III) Coordination Polymers with Rigid Triangular Spacer Ligands

Self Cite

Oxygen-sensitive and near-infrared( NIR) luminescent Yb III coordination polymers incorporatingl igandsb ased on pyrene derivatives were synthesized:Y b III -TBAPy and Yb III -TIAPy (TBAPy:1 ,3,6,8-tetrakis(p-benzoate)pyrene;T IAPy: 1,3,6,8-tetrakis(3,5-isophthalic acid)pyrene). The coordination structures of thesem aterials have been characterized by means of electrospray ionization mass spectrometry,X -ray diffractiona nalysis, and thermogravimetric analysis. Moreover,t he porouss tructure of Yb III -TIAPy has been evaluated by measuring its N 2 adsorption isotherm.T he NIR lumines-cence properties of Yb III -TBAPy and Yb III -TIAPy have been examined by acquiring emission spectra and determining emission lifetimes under air or argon and in vacuo. Yb III -TIAPy exhibitedh igh thermals tability (with ad ecomposition temperature of 400 8C), intensel uminescence (with an emission quantum yield under argon of 6.6 %), and effective oxygen-sensing characteristics. These results suggest that NIR luminescent Yb III coordination polymers prepared using pyrene derivatives could have applications in novel thermostable oxygen sensors.

Section: Emissionp Ropertiesmentioning

confidence: 62%

Near‐IR Luminescent Yb^III Coordination Polymers Composed of Pyrene Derivatives for Thermostable Oxygen Sensors

Hasegawa

Matsui

Kitagawa

et al. 2019

Self Cite

“…As their fluorescence arises from forbidden intramolecular f‐f transitions, it has a long‐lived excited‐state lifetime . Thus, the embedding of Eu III as well as Tb III complexes into the polymeric precursor P B is highly interesting for the formation of long‐lived, fluorescent material . Herein, the two precursor complexes [Eu(dbm) 3 (H 2 O) 2 ] and [Tb(acac) 3 (H 2 O) x ] were employed, since they offer exclusive 1:1 complex formation with phen due to their space demanding ligands, dibenzoylmethane (dbm) and acetylacetonate (acac) (Figure ).…”

Section: Resultsmentioning

confidence: 99%

“…[66] Thus, the embedding of Eu III as wella sT b III complexes into the polymericp recursor P B is highly interesting for the formation of long-lived, fluorescent material. [67] Herein, the two precursorc omplexes [Eu(dbm) 3 -(H 2 O) 2 ]a nd [Tb(acac) 3 (H 2 O) x ]w eree mployed, since they offer exclusive 1:1c omplex formation with phen duet ot heir space demanding ligands, dibenzoylmethane (dbm) and acetylacetonate (acac) (Figure 4). The two ligands dbm and acac were selected, as their respective energy levels closely match those of Eu III and Tb III ,w hichp romotes their fluorescent characteristics.…”

Section: Application Of P B For Lanthanide Complexationmentioning

confidence: 99%

Phenanthroline—A Versatile Ligand for Advanced Functional Polymeric Materials

Rothfuß

Knöfel

Tzvetkova

et al. 2018

The controlled incorporation of phenanthroline moieties into polymers is introduced, demonstrating their application as metal-ion complexing ligands for the construction of advanced macromolecular structures. Specifically, two phenanthroline-containing monomers based on acrylate and styrene functionalities, were synthesized. Each monomer was readily copolymerized with either N,N-dimethylacrylamide or styrene via nitroxide-mediated polymerization, resulting in narrowly distributed polar or non-polar copolymers. To demonstrate the versatility of the established polymer systems, the polar polymer was employed for transition metal induced single-chain nanoparticle formation, verified by diffusion-ordered NMR and UV/Vis spectroscopy. Furthermore, the non-polar polymer allows facile incorporation of lanthanide ions, creating luminescent metallo-polymers, in-depth characterized by advanced photophysical experiments and 2D NMR measurements.

“…In particular, the 5 D 0 state is a single level without any Stark splitting in any hosts. This can avoid the convolution of overlapping luminescence lines from different energy levels …”

Section: Introductionmentioning

confidence: 99%

“…This can avoid the convolution of overlapping luminescence lines from different energy levels. [8][9][10] Brusset et al [11,12] firstly reported the rare-earth vanadate T 8 V 2 O 17 ,where Trepresents aREi on site. However,the detailed structure is still controversial.…”

Section: Introductionmentioning

confidence: 99%

Eu³⁺‐Activated Gd₈V₂O₁₇: Energy Transfer, Luminescence, and Temperature‐Dependence Characteristics

Deng

Liu

Zhou

et al. 2018

A new phosphor of the type Gd Eu V O (x=0-1.0) was synthesized through the solid-state reaction ceramics method. A pure phase formation was verified by using X-ray powder diffraction measurements. The luminescence of Gd V O :Eu was investigated through optical and laser excitation spectroscopy. The luminescence curves were investigated in the temperature region 10 to 300 K. Gd V O shows a self-activated luminescence under excitation with UV- and near-UV light. The spectra, the decay lifetimes, and the thermal stability of Gd Eu V O (x=0.005-1.0) strongly depend on both the Eu concentration and the temperature. The tunable luminescence is realized by controlling the Eu -doping level to adjust the host energy-transfer efficiency from the VO groups to the Eu activators. At low Eu concentrations (<30 mol %), the intensity and lifetime show an unusual change with an increase of the temperature from 10-300 K, that is, the luminescence experiences a straightforward enhancement. The energy transfer from the VO group to the Eu ions could be accelerated with an increase of the temperature resulting in an unusual enhancement of the Eu luminescence and lifetime. However, the emission of the Eu ions decreased for highly Eu-doped samples (>30 mol %) with an increase of the temperature. The luminescence mechanism was discussed on the basis of the charge-transfer band of the Eu ions, the doping concentration, and the proposed microstructures in the lattices.